Adjustable gun sight



33-258 OR 291929544 SR March 5, 1940. 2,192,544

J. w. FISK ADJUSTABLE GUN SIGHT Filed May 9, 1939 Search Rum Patented Mar. 5, 1940 UNITED STATES QUCU bl! PATENT OFFICE 3 Claims.

This invention relates to improvements in sights for guns and pertains particularly to a sight which is designed primarily for use upon shotguns.

The present invention has for its primary object to provide a sight, particularly a shotgun sight, which is designed to be readily adjusted both vertically and laterally with respect to the gun barrel.

Another object of the invention is to provide an adjustable bead sight for a gun which is semiautomatic in that as soon as the means employed for holding it in place is released, it will be shifted outwardly to a maximum raised position from which it may be set as desired, so as to cause the gun to shoot high or low according to the conditions under which the gun is used or possibly to compensate for some inaccuracy which may have developed in the manufacture of the sun.

A further object of the invention is to provide an improved gun sight which is of extremely simple design and which may be readily adjusted either vertically or laterally with respect to the gun barrel and wherein such adjustment may be effected easily and quickly merely by the manipulation of a securing screw.

Other objects and advantages of the invention will become apparent as the description proceeds and the invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawing forming part of this specification, with the understanding, however, that the invention is not to be confined to any strict conformity with the showing of the drawing but may be changed or modified so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawing:

Fig. 1 is a view in side elevation of the muzzle portion of a gun barrel showing a part of the rib in section to illustrate the improved sight embodying the present invention, mounted in the rib.

Fig. 2 is a view in top plan of the structure as shown in Fig. 1.

Fig. 3 is a view in side elevation of a modified form of the sight, per se.

Fig. 4 illustrates a further modification of the sight.

Fig. 5 is a view in top plan of the form of the sight shown in Fig. 4.

Fig. 6 is a view in elevation of another modification.

Fig. 7 is a view in top plan of the modification shown in Fig. 6.

Referring now more particularly to the drawing, the numeral I designates a portion of the muzzle end of a shotgun barrel. The present adjustable bead sight has been designed primarily for use upon shotgun barrels but it is to be understood that it is not to be limited to such use as it may be adapted to rifle barrels or to pistols. The barrel I here illustrated is shown with a rib 2 extending longitudinally of the top thereof, in which rib at the nozzle end of the barrel, is set the usual bead sight. In carrying out the present invention, the usual or ordinary shotgun bead sight is removed and the bore 3, from which the fixed bead sight has been removed, is enlarged, if necessary, to receive the present improved sight in the manner shown.

The sight embodying the present invention comprises a short cylindrical body 4 which is snugly positioned within the bore 3 in the barrel rib 2. This body is provided with a longitudinally extending bore which opens through its inner end, as indicated at 5, and in this bore is secured one end of an expansion spring 6, the other end of which spring bears against the bottom of the bore 3 of the rib. While the fit of the body 4 in the bore is snug, it is not so close or tight as to prevent the spring 6 from shifting the body 4 outwardly when the body is released, therefore, the sight will automatically shift its position when it has been pushed down into the bore 3, when the holding means, hereinafter described, is disengaged therefrom.

The body 4 of the sight supports upon its upper end the head or bead I which, as shown in Fig. 2, is eccentric to the body 4 so that when this body is turned in the bore 3, the bead may be moved across or laterally of the rib 2 and the barrel I.

Directly in front of the sight body 4, the rib 2 is provided with a threaded passage for the reception of the shank portion 8 of a screw 9. This screw is provided with a relatively large flat head 10' of circular form, but having a portion of its edge flattened as indicated at H. The screw head is also provided with a suitable slot or kerf for engagement by a screw driver.

The threaded bore or passage for receiving the stem 8 of the screw is set 'with respect to the bore 3 so that when the screw is turned to bring the flat side ll of the head adjacent the bore 3, this flat side will be flush with the edge of the liUUHl bore and thus when the head is turned to move the fiat side away from the bore, the other part or rounded part of the head will project slightly over the bore 3. It will thus be seen that when the sight body 4 is in the bore 3 and has been adjusted so as to raise or lower the head 1 or move it across the barrel to a desired position, and the screw 9 is turned to shift the fiat side I I away from the sight body, the edge of the head of the screw will come into firm contact with the body 4 and bind it firmly in the bore 3. By this means, it will be held both against turning and against longitudinal movement under the urge of the spring '6.

When the screw 9 is loosened or turned to bring the fiat side adjacent to the body 4, then the spring 6 may function to shift the body outwardly and the desired adjustment of the bead can be made.

By placing the screw 9 in front of the sight body 4, it will not interferein any manner with the use of the sight.

While the sight thus far described has been described as having the bead portion 1 eccentric to the body 4, it is to be understood that this may be made concentric with the body if desired, so that there will thus be provided in such a form of the sight means only of making a vertical adjustment of the bead instead of both vertical and lateral adjustments.

It is also contemplated as within the scope of the present invention, to make the sight of materials of contrasting color as illustrated in Figs. 3 to 5, where the sight, which is indicated by the numeral I2, is vertically divided into two portions, one of which is white, as indicated at l3, while the other portion is colored, as indicated at M. This sight may be made with the bead in the center of the body so that only an up and down adjustment is had or the bead may be ofiset from the body so that by rotating the body, a lateral adjustment of the bead can also be effected.

In Figs. 4 and 6, two other forms of the sight are shown, in one of which forms the sight, which is generally designated by the numeral I5, has the bead portion I6 provided with two opposite flat facesv I1, while in the other form, the sight body, generally indicated by the numeral l8, has the bead portion l9 with one side flattened, as indicated at 20, the remainder of the bead being round or constituting a portion of a sphere. These sights may be made of any suitable material such as metal, ivory or Catalin or any other suitable composition material and may be also all of one color or of two colors, as illustrated.

In illustrating the application of the sight, the barrel I has been described as having a rib along the top thereof. Some shotguns have plain barrels, that is, they do not have the rib 2 extending along the top thereof, and in this case it would be necesary to first sweat onto the barrel a block or ramp to hold the sight, and such block or ramp would then be provided with the necessary opening or bore corresponding to the bore 3 to receive the body of the sight, and would also have the securing screw fitted thereto, as described in connection with the rib 2.

What is claimed is:

1. In a gun having a body secured longitudinally on the top of the barrel, a sight comprising a vertically disposed cylindrical body, the said first body having an upwardly opening bore in which said cylindrical body is rotatably and longitudinally movable, spring means secured to the underside of the cylindrical body and bearing against the bottom of said bore to normally urge the cylindrical body outwardly, a b e ag upported upon the outer end of the cylindrical body, a headed screw threaded into the first body adjacent the cylindrical body, said headed screw when in one position having the head in frictional contact with the cylindrical body to secure the latter against movement and having a flattened edge portion which when brought into opposed relation with the cylindrical body is free from contact therewith permitting movement of the cylindrical body in said bore.

2. In a gun having a body secured longitudinally on the top of the barrel, a sight comprising a vertically disposed cylindrical body, the said first body having an upwardly opening bore in which said cylindrical body is rotatably and longitudinally movable, a bead supported upon the outer end of the cylindrical body, a headed screw threaded into the first body adjacent the cylindrical body, said headed screw when in one position having the head in frictional contact with the cylindrical body to secure the latter against movement and having a flattened edge portion which when brought into opposed relation with the cylindrical body is free from contact therewith permittingmovement of the cylindrical body in said bore, said bead being eccentric to the long axis of the cylindrical body whereby rotation of the cylindrical body in the bore will effect the movement of the bead across the barrel.

3. A sight for a gun having a barrel provided with an outwardly opening bore in the top thereof, comprising an elongated cylindrical body adapted to position in said bore, the body being designed for longitudinal and rotary movement in the bore, a bead carried eccentrically upon the outer end of said body, resilient means engaging the body and the barrel and constantly urging the body outwardly in said bore and means for securing said body in adjusted position in said bore, comprising a screw threaded into the barrel adjacent the bore, the screw having a head provided with a circular periphery, a portion of which is flattened slightly, the screw being disposed relative to said bore whereby the circular portion of the head will frictionally'contact the body to hold it in adjusted position, the flattened portion of the screw head periphery when brought into opposed relation with the body being spaced therefrom to permit shifting of the body.

JOHN W. FISK. 

